Grate-vibrating device for chain-grate stokers.



B. L MORRISON. GRAIE VIBRATIIIIG DEVICE FOR CHAIN GRATE STOKERS.

APPLICATION FILED MAR. 10, I914.

. Patented Apr, 20, 11915.

2 SHEETS-SHEET 1.

I wwmm ATTORNEYS THE NORRIS PETERS 60.. PHOTQLITHOH WASHINGTON. Dv C B. J. MORRRSON.

GRATE VIBRATING DEVICE FOR CHAIN GRATE STOKERS.

APPLICATION FILED MAR. 10. 19:4.

m1 3mm Patented Apr. 20, 19115,

2 SHEETS-SHEET 2.

5 v e] 15 TD 16 22 F I f1 j fi fl 3? WITNESSES: I l/VVENTOI? WWW. W

nz omwsys' 2M A W' THE NORRIS PETERS 50.. PHOTO-LITHO). WASHINGTON, D. C.

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nAnrnoLoMnW .r. MORRISON, or new YORK, n. Y., ASSIGNOR ro nnwazan a. nulvn'ari,

or new YORK, N. Y.

GRATE-VIBRA'IING DEVICE FOR CHAIN-GRATE STOKERS.

To all whom it may concern.

Be it known that l, BARTHOLOMEW J. Mon- RISON, a citizen of the United States, and a resident of New York city, in the county of New York and State of New York, have invented certain new and useful Improvements in Grate-Vibrating Devices for Chain Grate Stoker's, of which the following is a specification.-

This invention relates to mechanical stokers, particularly of the chain grate type.

In the course ofoperation of a chain grate stoker, especially with a finely comminuted fuel such as buckwheat coal or the like, it is found that the fuel will cake and form a crust which eifectually'prevents the progressive movement of the fuel necessary in a mechanical stoker. In many cases, the grate will move along free of the. fuel and the latter remain clogged and stationary above the grate. To overcome this, attempt has hitherto been'made to leave some slack in the chain for the purpose of forming a series of catenary waves between the usual rollers supporting the upper run. This has not been found satisfactory for the reason that the slack is taken up to a large extent by the driving-sprocket wheel and, as a result, little or no vertical motion of the grate bar would be obtained.

The present invention has for its principal object to provide positively acting means n hereby the grate bars are given substantially vertical vibratory motion, whereby the fuel is broken up and the possibility of clogging is eliminated.

A further object is to provide adjusting means whereby the extent of the vibratory motion of the grate bars may be varied.

Another object is to provide means en gaging the grate bars to prevent their canting or skewing during their travel.

The various further objects and advantages will more fully appear from the detailed description and the features of novelty of the invention will be particularly pointed out in the claims.

In the drawings illustrating this invention, Figure 1 is a sectional elevation of a chain grate stoker located in the fire boX of a steam boiler with the improved vibrating means applied thereto. Fig. 2 is a detail view illustrating the vibrating means in one position. Fig. 3 is a detail view illustrating the vibrating means in another posi- Specificationof Letters Patent. Pamgntgfl App, 2Q, T9115, Application filed IVIareh 10, 1914. Serial No. 823,662. r l

tion. Fig. 4L is a detail view of the vibrating sprockets mounted on a common shaft.

, Referring indetail to the drawings, the

chains 10 driven by the sprocket wheels 11 and 12 carry the grate bars 18. For supporting the upper run of the grate bearing the fuel, I providemeans which in addition to its function as a support serves also to positively vibrate the grate bars in a substantially vertical direction and thereby to break up the fuel so as to prevent its caking and clogging. These supports consist of a series ofsprocket wheels 1 1, 15, 16, 17, etc, mounted in pairs upon shafts 14 15, etc, carried in the side frames of the stoker. The supporting sprocket wheels are positively driven by the chains themselves, and in the course of their revolution, vibrate the links carrying the grate bars in a substantially vertical direction, so as to accomplish the object above explained. Certain of the sprocket wheels such as 15, 17, etc., may be of larger throw than the others and thus impart at the corresponding points, a greater degree of vibration to the grate bars. Referring particularly to Figs. 2 and 3, it will be noted that the sprocket wheel 15 has the teeth 18 and the intermediate depressed faces 19 upon which the links of the chain areborne. When the sprocket wheel is rotated to the position shown in Fig. 2 and then to the position shown in Fi g. 3, a substantially vertical vibratory mo tion is imparted to the grate bar 13 This motion is positive as the sprocket wheels are driven by the chains and in their rotation act as eccentrics to lift and lower the grate bars. It will be noted that the sprockets 16 having a smaller throw impart a smaller degree of movement to the. grate bars than the larger sprockets 15.

For varying the degrees of vibratory motion of the grate bars, the sprocket wheels 15, 17, etc., may be adjusted upon their shafts 15 17 etc., so as to shift the sprockets to varying degrees of eccentricity with respect to their shafts. Any form of adjustment will answer the purpose. I have illustrated the sprocket wheel 15 as formed with an extended slot 20 through which the square shaft 15 passes. At the ends of the slot are disposed transverse lugs 21 through which passes a screw 22 threaded in the shaft 15 When this screw is turned, the sprocket wheel is shifted axially to the shaft,

. grate bars carried thereby,

1 claim as new Patent:

, tionQ. As the corresponding sprocket wheels arefrigidly coupled by reason of their niounting upon the same shaft, they will hold the grate bars in proper transverse position and will prevent their canti ng or skewing during t'heir course of vibratory motion. I

Although 'I have described a preferred form in. which my invention may be embodied, it will be understood that various changes within the skill ofa mechanic may be resorted to without departing from the spirit of my invention and the scope'of the appended claims. v Having thus described my and desire to secure by Letters 1. A chain grate stoker comprising chains,

means'fo'r actuating the chains, and means driven by the chains independently of the actuating means for imparting asubstantially vertical vibratorymot'ion to the grate bar's.

. 2. A chaingrate stoker comprising chains, grate bars carried thereby, means for actuating the chains, and sprocket wheel's actuated by'fthe chains independently of the actuating means for imparting av substantially verticalvibratory motionto the grate bars.

3. A-chain grate stoker comprising chains, grate bars carried thereby, means for actuatingthe chains, a sprocket wheel engaging each chain and driven thereby independthe grate'bars, and

ently of the actuating means for imparting a substantially vertical vibratory motion to means for rigidly cou- 'plingthe corresponding sprocket wheels together.

ti A. chaingrate stoker comprising chains, gratefbars carried thereby, means for actupositively driven by the chains only for imparting a substantially vertical vibratory motion .to'

the grate barsyand means for varying the extent of the vibratory motion.

5; A chain grate stcker comprising chains, grate bars carried thereby, means for actuating-the chains, sprocket wheels actuated byfth-echains but'otherwise independent of invention, I

said actuating means for imparting a substantially vertical vibratory motion to the grate bars, and means for adjusting the sprocket wheels'to vary the extent of vibratory motion of the grate bars.

6. A chain grate stoker comprising chains, grate bars carried thereby, means for actuating the chains, sprocket wheels actuated by 'the'chains for imparting a substantially vertical vibratory motion to the grate bars, and means for shifting the sprocket wheels with reference to their axis of rotation for varying the extent of vibratory motion of the grate bars.

7. A chain grate stoker comprising chains, grate bars carried thereby, means for actuating the chains, a sprocket wheel engaging each chain and driven thereby for imparting a substantially vertical vibratory motion to the grate bars, means for rigidly cou pling the corresponding sprocket wheels together, and means for shifting the sprocket wheels radially with respect to their rigid coupling for varying the extent of vibratory motion to the grate bars.

8. A. chain grate Stoker comprising chains, grate bars carried thereby, means for actuating the chains, av sprocket wheel engaging each chain and driven thereby for imparting a substantially vertical vibratory motion to the grate bars, a shaft on which the cor-- responding sprocket wheels are mounted, and means engaging the shaft for shifting the sprockets radially with respect thereto for varying the extent of vibration of the grate bars.

9. Achain grate stoker comprising a pair of chains, driving means therefor, grate bars carried by-the chains, and means for imparting a substantially vertical vibratory motion to the grate bars comprising a series of sprocket wheels driven by the chains, the members of the series having varying extent of throw whereby a varying extent of substantially vertical vibratory motion is imparted to the grate bars during the course of their travel.

Signed at New York city, in the county of New York and State of New York, this 3rd day of March A. D. 1914.

BARTHOLOMEYV J. MORRISON.

Witnesses WM. I. COHN, MINNIE S. MILLER.

Copies of thispate'nt may-be obtained: for five cents each, by addressing the Commissioner of Patents,

- i a Washington, D. C. 

